EP1555462B1 - Verfahren und Einrichtung zur Sicherstellung der richtigen Bedienung eines Fahrbereichwählers für ein Fahrzeuggetriebe - Google Patents

Verfahren und Einrichtung zur Sicherstellung der richtigen Bedienung eines Fahrbereichwählers für ein Fahrzeuggetriebe Download PDF

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Publication number
EP1555462B1
EP1555462B1 EP04106993A EP04106993A EP1555462B1 EP 1555462 B1 EP1555462 B1 EP 1555462B1 EP 04106993 A EP04106993 A EP 04106993A EP 04106993 A EP04106993 A EP 04106993A EP 1555462 B1 EP1555462 B1 EP 1555462B1
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EP
European Patent Office
Prior art keywords
range
gear
shifting
high range
vmin
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EP04106993A
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English (en)
French (fr)
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EP1555462A1 (de
Inventor
Gianpaolo Magri
Carlo Moretti
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Iveco SpA
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Iveco SpA
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/16—Inhibiting or initiating shift during unfavourable conditions, e.g. preventing forward reverse shift at high vehicle speed, preventing engine over speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/02—Selector apparatus
    • F16H59/04—Ratio selector apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/36—Inputs being a function of speed
    • F16H59/44—Inputs being a function of speed dependent on machine speed of the machine, e.g. the vehicle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
    • F16H63/30—Constructional features of the final output mechanisms
    • F16H63/34—Locking or disabling mechanisms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/40—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism comprising signals other than signals for actuating the final output mechanisms
    • F16H63/44—Signals to the control unit of auxiliary gearing

Definitions

  • This invention relates to a method and control device to ensure the correct operation of a range selector in a vehicle transmission, see for instance US 6109126 A .
  • Some vehicles for example commercial or industrial vehicles, have a transmission with a large number of forward gears.
  • a typical transmission has nine forward gears and one reverse gear RM.
  • each position of the gear shift lever corresponds to a different gear.
  • this solution is not ergonomically sound, in that, as shown in the diagram, the side-to-side travel of the gear shift lever is excessive for use where there is a limited amount of space said as the driver's cab.
  • Fig. 2 In the repeat-H shift pattern, on the other hand, (Fig. 2) the same position is used for two gears, a reduced ratio in low range and normal ratio in high range.
  • a device called the range selector enables the transmission to be split into two separate ranges, low range and high range.
  • the range selector is used to move from reduced ratios, low range L, to normal ratios, high range H, and vice versa.
  • the range selector preferably consists of an epicycloid reduction unit operated by means of a pneumatic valve, which controls gear selection in a way that is well-known in the prior art.
  • the range selector is operated by means of a manually-operated switch, for example on the gear shift knob assembly, and may vary in shape, according to the specific model.
  • the first forward gear is really only a crawler gear CR, and is not affected by the range selector; this gear is only actually used in extremely steep conditions or with particularly heavy loads and for low speed maneuvering.
  • the range selector divides the other eight gears into low range (1 st , 2 nd , 3 rd , 4 th ) and high range (5 th , 6 th , 7 th 8 th ).
  • the first gear that is actually used is 1 st and not the crawler gear.
  • this solution is far more ergonomically sound, in that it results in a considerable reduction in the side-to-side gear selection movement, but on the other hand there is a risk of improper use of the range selector by the driver, which could result in incorrect shifting, especially in inadvertently downshifting through several positions to a lower ratio, e.g. from 7 th to 2 nd .
  • the purpose of this invention is to overcome all the drawbacks described above by presenting a particularly effective and easy-to-use method and device for controlling the correct operation of a range selector in a vehicle transmission.
  • the invention refers in particular to a method and device for controlling the correct operation of a range selector in a vehicle transmission, as specified in the claims, which are an integral part of this description.
  • the system is used to control shifting from high range to low range (H ⁇ L), as there are no risks involved in performing the reverse operation. Thus shifting from low range to high range is always possible.
  • the first step consists of setting a minimum speed Vmin below which range shifting is always allowed.
  • Vmin 19 km/h
  • Vmin 19 km/h
  • the second step consists of only enabling downshifting from H ⁇ L when the vehicle is traveling at a speed of > Vmin when shifting from the first high range gear position above the range shift point (5 th gear in the example above).
  • the rotational speed of the transmission output shaft is more than rpm1, e.g. 2,200, which corresponds to a second vehicle speed of more than Vmin
  • signaling devices said as a flashing indicator lamp on the dashboard and/or a buzzer
  • the range shift is permitted. If any other high range gear has been engaged (6 th , 7 th , 8 th ) downshifting from H ⁇ L is not allowed.
  • signaling devices said as a flashing indicator lamp on the dashboard and/or a buzzer, are activated.
  • control unit CENTR that manages control panel operations (known as the body controller in technical jargon), to implement the various stages of the procedure, using the programming language already used by the control unit.
  • the following actuators/switches are also used to supply the necessary input signals to the body controller.
  • a range pre-selection switch, IPG located on the knob of the gear shift lever, of any known type, with two stable positions, high range and low range. It is operated by the driver and indicates the intention to change range.
  • a neutral switch, IF that indicates the neutral position.
  • a possible embodiment is illustrated in figures 4 and 5.
  • a neutral switch IF is applied to an external control device COM for a transmission system.
  • the pushbutton PL on such neutral switch IF engages against a gear selector rod SEL.
  • the movement of the rod SEL (in the example in the drawing this is at a right angle with the plane of the drawing) corresponds to the movement of the gear shift lever in the horizontal direction of the neutral axis (fig. 2).
  • 5 th gear switch INTQ which senses when the 5 th gear is selected, for example located inside the transmission system, in a known way. Range shifting is only enabled when changing from 5 th gear.
  • An indicator showing the number of output shaft revolutions which gives the number of engine revolutions and the vehicle speed, since there is a fixed ratio between the number of revolutions of the output shaft and the number of wheel revolutions.
  • Such signal is available on an existing data transmission line, called CAN (Control Area Network), coming from the body controller and in particular it supplies information about Vmin and rpm1 values.
  • a low range indicator switch IGB for example located on the range selector device in any known way, that is used for instance to activate the flashing indicator lamp and buzzer.
  • control unit CENTR receives the input signals described above, and sends out the command signals SC1 to the solenoid valves that actuate the range selector, and the command signals SC2 for the flashing indicator lamp and buzzer signals, in accordance with the control system described above.
  • H ⁇ L shifting is enabled and the control unit sends the signal SC1 to the solenoid valve that enables range shifting.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Transmission Device (AREA)
  • Gear-Shifting Mechanisms (AREA)

Claims (6)

  1. Verfahren zum Steuern des Schaltens vom hohen Fahrbereich in den niedrigen Fahrbereich durch einen Fahrbereichswähler in einem Fahrzeuggetriebe,
    wobei das Verfahren durch die folgenden Schritte gekennzeichnet ist:
    - immer Ermöglichen, dass vom hohen Fahrbereich in den niedrigen Fahrbereich geschaltet wird, wenn das Fahrzeug mit einer niedrigeren Geschwindigkeit als ein Minimalwert (Vmin) fährt;
    - nur dann Ermöglichen, dass vom hohen Fahrbereich in den niedrigen Fahrbereich geschaltet wird, wenn das Fahrzeug mit einer Geschwindigkeit fährt, die höher als der genannte Minimalwert (Vmin) ist, wenn von der Stellung des ersten Gangs des hohen Fahrbereichs über den Fahrbereichsschaltpunkt geschaltet wird;
    - nur dann Ermöglichen dass vom hohen Fahrbereich in den niedrigen Fahrbereich geschaltet wird, wenn der Schalthebel von der genannten Stellung des ersten Gangs des hohen Fahrbereichs kommend über den Fahrbereichsschaltpunkt durch die richtige Neutralstellung geht.
  2. Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, dass das genannte Herunterschalten von irgendwelchen anderen Stellungen in dem Abschnitt des hohen Fahrbereichs als von der genannten Stellung des ersten Gangs des hohen Fahrbereichs über dem Fahrbereichsschaltpunkt nicht möglich ist.
  3. Verfahren gemäß Anspruch 2, dadurch gekennzeichnet, dass Signalisierungsvorrichtungen wie etwa blinkende Anzeigelampen und/oder ein Summer aktiviert werden.
  4. Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, dass die Signalisierungsvorrichtungen wie etwa blinkende Anzeigelampen und/oder ein Summer aktiviert werden, wenn das Fahrzeug mit einer Geschwindigkeit von mehr als einem zweiten Wert über dem genannten Minimalwert (Vmin) fährt.
  5. Vorrichtung zum Steuern des Schaltens vom hohen Fahrbereich in den niedrigen Fahrbereich durch einen Fahrbereichswähler in einem Fahrzeuggetriebe zur Realisierung des Verfahrens gemäß einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Vorrichtung umfasst:
    - einen Fahrbereichs-Vorauswahlschalter (IPG) mit zwei stabilen Stellungen, hoher Fahrbereich und niedriger Fahrbereich, der die Absicht angibt, den Fahrbereich zu ändern;
    - einen Neutralschalter (IF), der die Neutralstellung angibt;
    - einen Schalter zur Angabe der Stellung des ersten Gangs des hohen Fahrbereichs über dem Fahrbereichsschaltpunkt (INTQ), der die Auswahl der genannten Stellung des ersten Gangs des hohen Fahrbereichs über dem Fahrbereichsschaltpunkt abfühlt;
    - einen Abtriebswellen-Umdrehungszähler-Signalgenerator (CAN), der Informationen über den genannten Minimalwert (Vmin) und über die Fahrgeschwindigkeit liefert;
    - einen Schalter des Anzeigers des niedrigen Fahrbereichs (IBG);
    - eine Steuereinheit (CENTR), die gemäß dem Verfahren eines der Ansprüche 1 bis 4 die Signale von den genannten Vorrichtungen empfängt und Befehlssignale für den genannten Fahrbereichswähler sowie Befehlssignale für die genannten Anzeigevorrichtungen aussendet.
  6. Vorrichtung gemäß Anspruch 5, dadurch gekennzeichnet, dass der genannte Neutralschalter (IF) auf eine externe Steuervorrichtung (COM) für ein Getriebesystem angewendet wird und folgendes umfasst:
    einen Druckknopf (PL), der gegen die Gangauswahlstange (SEL) der genannten externen Steuervorrichtung (COM) in Eingriff gelangt;
    eine Nut (IN) entlang der Gangauswahlstange SEL, in der das Ende des Druckknopfs (PL) so aufgenommen werden kann, dass der Druckknopf zwei Stellungen in der Bewegung der Stange abfühlen kann: eine Stellung, die der richtigen Neutralstellung entspricht, und die andere Stellung, die einer falschen Neutralstellung entspricht.
EP04106993A 2004-01-19 2004-12-27 Verfahren und Einrichtung zur Sicherstellung der richtigen Bedienung eines Fahrbereichwählers für ein Fahrzeuggetriebe Active EP1555462B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20040057 2004-01-19
IT000057A ITMI20040057A1 (it) 2004-01-19 2004-01-19 Procedimento e dispositivo di controllo del corretto azionamento di un selettore di passaggio gamma di un cambio marce per veicolo

Publications (2)

Publication Number Publication Date
EP1555462A1 EP1555462A1 (de) 2005-07-20
EP1555462B1 true EP1555462B1 (de) 2007-08-29

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Application Number Title Priority Date Filing Date
EP04106993A Active EP1555462B1 (de) 2004-01-19 2004-12-27 Verfahren und Einrichtung zur Sicherstellung der richtigen Bedienung eines Fahrbereichwählers für ein Fahrzeuggetriebe

Country Status (5)

Country Link
EP (1) EP1555462B1 (de)
AT (1) ATE371823T1 (de)
DE (1) DE602004008570T2 (de)
ES (1) ES2290632T3 (de)
IT (1) ITMI20040057A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007024793A1 (de) * 2007-05-26 2008-11-27 Zf Friedrichshafen Ag Handschaltbares Stufengetriebe für Kraftfahrzeuge
GB2528862A (en) 2014-07-31 2016-02-10 Jaguar Land Rover Ltd Gear selector

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5263379A (en) * 1991-12-14 1993-11-23 Eaton Corporation Automatic range shift arrangement
US6109126A (en) * 1998-05-27 2000-08-29 Transmission Technologies Corporation Shift control system for an auxiliary section of a compound vehicular transmission
US6520040B2 (en) * 2000-04-03 2003-02-18 Eaton Corporation Range control for manual transmission
DE10029497A1 (de) * 2000-06-15 2002-01-10 Zahnradfabrik Friedrichshafen Elektro-pneumatische Schalteinheit
DE10152860A1 (de) * 2001-10-25 2003-05-08 Zahnradfabrik Friedrichshafen Automatisches Verfahren zum Schalten eines Mehrgruppengetriebes und einer Schalteinrichtung für Kraftfahrzeuge

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
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None *

Also Published As

Publication number Publication date
DE602004008570T2 (de) 2008-05-21
ATE371823T1 (de) 2007-09-15
ITMI20040057A1 (it) 2004-04-19
ES2290632T3 (es) 2008-02-16
DE602004008570D1 (de) 2007-10-11
EP1555462A1 (de) 2005-07-20

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